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Extended Drude model and role of interband transitions in the mid-infrared spectra of pnictides

By L. Benfatto, E. Cappelluti, L. Ortenzi and L. Boeri

Abstract

We analyze the outcomes of an extended-Drude-model approach to the optical spectra of pnictides, where the multiband nature of the electronic excitations requires a careful analysis of the role of interband processes in the optical conductivity.Through a direct comparison between model calculations of the intraband optical spectra and experimental data, we show that interband transitions,whose relevance is shown by first-principle calculations,give a non negligible contribution already in the infrared region. This leads to a substantial failure of the extended-Drude-model analysis on the measured optical data without subtraction of interband contributions.Comment: 6 pages, 4 figure

Topics: Condensed Matter - Superconductivity
Year: 2011
DOI identifier: 10.1103/PhysRevB.83.224514
OAI identifier: oai:arXiv.org:1104.1346
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